I run into this also. trailing_commas: preserve not restores pre-3.7 "short" style where comma decides line break. This is the "tall" style where ALL lines are break. Thats wierd. You have to fix sdk ...

Did you know? Dart 3.8 introduces a new formatting option to preserve trailing commas. Enable this to override the default formatter behaviour (introduced in Dart 3.7), which is to remove trailing ...

Support of V.44, V.90, V.91 and V.92 and improved support for mode selection Superseded ...